Add collision options, fixes #95. (By default auto teams players until they're added to a team so you can't push!)

src/main/java/us/myles/ViaVersion/ConnectionInfo.java

@@ -18,6 +18,7 @@ public class ConnectionInfo {
     private int protocol = 0;
     private int compression = 0;
     private boolean active = true;
+    private String username;
 
     public ConnectionInfo(SocketChannel socketChannel) {
         this.channel = socketChannel;
@@ -100,4 +101,12 @@ public class ConnectionInfo {
     public void closeWindow() {
         this.openWindow = null;
     }
+
+    public void setUsername(String username) {
+        this.username = username;
+    }
+
+    public String getUsername() {
+        return username;
+    }
 }

src/main/java/us/myles/ViaVersion/ViaVersionPlugin.java

@@ -28,6 +28,7 @@ import us.myles.ViaVersion.update.UpdateUtil;
 import us.myles.ViaVersion.util.ReflectionUtil;
 
 import java.lang.reflect.Field;
+import java.util.Collection;
 import java.util.List;
 import java.util.Map;
 import java.util.UUID;
@@ -158,6 +159,16 @@ public class ViaVersionPlugin extends JavaPlugin implements ViaVersionAPI {
         return getConfig().getBoolean("sync-chunks", true);
     }
 
+    public boolean isPreventCollision() {
+        return getConfig().getBoolean("prevent-collision", true);
+    }
+
+    public boolean isAutoTeam() {
+        // Collision has to be enabled first
+        if(!isPreventCollision()) return false;
+        return getConfig().getBoolean("auto-team", true);
+    }
+
     public void setDebug(boolean value) {
         this.debug = value;
     }

src/main/java/us/myles/ViaVersion/transformers/OutgoingTransformer.java

@@ -253,10 +253,6 @@ public class OutgoingTransformer {
             return;
 
         }
-        // If login success
-        if (packet == PacketType.LOGIN_SUCCESS) {
-            info.setState(State.PLAY);
-        }
         if (packet == PacketType.LOGIN_SETCOMPRESSION) {
             int factor = PacketUtil.readVarInt(input);
             info.setCompression(factor);
@@ -277,12 +273,16 @@ public class OutgoingTransformer {
             return;
         }
         if (packet == PacketType.LOGIN_SUCCESS) {
-            String uu = PacketUtil.readString(input);
-            PacketUtil.writeString(uu, output);
-            UUID uniqueId = UUID.fromString(uu);
+            info.setState(State.PLAY);
+
+            String uuid = PacketUtil.readString(input);
+            PacketUtil.writeString(uuid, output);
+            UUID uniqueId = UUID.fromString(uuid);
             info.setUUID(uniqueId);
             plugin.addPortedClient(info);
-            output.writeBytes(input);
+            String username = PacketUtil.readString(input);
+            info.setUsername(username);
+            PacketUtil.writeString(username, output);
             return;
         }
 
@@ -548,6 +548,10 @@ public class OutgoingTransformer {
             clientEntityTypes.put(id, EntityType.PLAYER);
             output.writeInt(id);
             output.writeBytes(input);
+            // send fake team
+            if (plugin.isAutoTeam()) {
+                sendTeamPacket(true);
+            }
             return;
         }
         if (packet == PacketType.PLAY_SPAWN_PLAYER) {
@@ -612,7 +616,33 @@ public class OutgoingTransformer {
                 output.writeByte(input.readByte());
                 PacketUtil.writeString(PacketUtil.readString(input), output);
 
-                PacketUtil.writeString("", output); // collission rule :)
+                PacketUtil.writeString(plugin.isPreventCollision() ? "never" : "", output); // collission rule :)
+
+                output.writeByte(input.readByte());
+            }
+            if (mode == 0 || mode == 3 || mode == 4) {
+                // add players
+                int count = PacketUtil.readVarInt(input);
+                PacketUtil.writeVarInt(count, output);
+
+                for (int i = 0; i < count; i++) {
+                    String name = PacketUtil.readString(input);
+                    if (plugin.isAutoTeam() && name.equalsIgnoreCase(info.getUsername())) {
+                        if (mode == 4) {
+                            // since removing add to auto team
+                            plugin.run(new Runnable() {
+                                @Override
+                                public void run() {
+                                    sendTeamPacket(true);
+                                }
+                            }, false);
+                        } else {
+                            // since adding remove from auto team
+                            sendTeamPacket(false);
+                        }
+                    }
+                    PacketUtil.writeString(name, output);
+                }
             }
             output.writeBytes(input);
             return;
@@ -634,15 +664,13 @@ public class OutgoingTransformer {
                         tag.put(spawn);
                         DataOutputStream out = new DataOutputStream(new ByteBufOutputStream(output));
                         NBTIO.writeTag(out, tag);
-                    }
-                    else if(tag != null) { // EntityID does not exist
+                    } else if (tag != null) { // EntityID does not exist
                         CompoundTag spawn = new CompoundTag("SpawnData");
                         spawn.put(new StringTag("id", "AreaEffectCloud")); //Make spawners show up as empty when no EntityId is given.
                         tag.put(spawn);
                         DataOutputStream out = new DataOutputStream(new ByteBufOutputStream(output));
                         NBTIO.writeTag(out, tag);
-                    }
-                    else { //There doesn't exist any NBT tag
+                    } else { //There doesn't exist any NBT tag
                         input.readerIndex(index);
                         output.writeBytes(input, input.readableBytes());
                     }
@@ -720,6 +748,42 @@ public class OutgoingTransformer {
         }
         output.writeBytes(input);
     }
+    private void sendCreateTeam() {
+        ByteBuf buf = info.getChannel().alloc().buffer();
+        PacketUtil.writeVarInt(PacketType.PLAY_TEAM.getNewPacketID(), buf);
+        PacketUtil.writeString("viaversion", buf);
+        buf.writeByte(0); // make team
+        PacketUtil.writeString("viaversion", buf);
+        PacketUtil.writeString("", buf); // prefix
+        PacketUtil.writeString("", buf); // suffix
+        buf.writeByte(0); // friendly fire
+        PacketUtil.writeString("", buf); // nametags
+        PacketUtil.writeString("never", buf); // collision rule :)
+        buf.writeByte(0); // color
+        PacketUtil.writeVarInt(0, buf); // player count
+        info.sendRawPacket(buf);
+    }
+    private void sendTeamPacket(boolean b) {
+        ByteBuf buf = info.getChannel().alloc().buffer();
+        PacketUtil.writeVarInt(PacketType.PLAY_TEAM.getNewPacketID(), buf);
+        PacketUtil.writeString("viaversion", buf); // Use viaversion as name
+        if (b) {
+            // add
+            buf.writeByte(0); // make team
+            PacketUtil.writeString("viaversion", buf);
+            PacketUtil.writeString("", buf); // prefix
+            PacketUtil.writeString("", buf); // suffix
+            buf.writeByte(0); // friendly fire
+            PacketUtil.writeString("", buf); // nametags
+            PacketUtil.writeString("never", buf); // collision rule :)
+            buf.writeByte(0); // color
+            PacketUtil.writeVarInt(1, buf); // player count
+            PacketUtil.writeString(info.getUsername(), buf); // us
+        } else {
+            buf.writeByte(1); // remove team
+        }
+        info.sendRawPacket(buf);
+    }
 
     public static String fixJson(String line) {
         if (line == null || line.equalsIgnoreCase("null")) {

src/main/resources/config.yml

@@ -3,3 +3,8 @@ checkforupdates: true
 # Should we send any bulk chunks, in sync (may be slower but fixes timings)
 # Currently broken due to sign updates, possibly will return
 sync-chunks: true
+# No collide options, these allow you to configure how collision works.
+# Do you want us to prevent collision?
+prevent-collision: true
+# If the above is true, should we automatically team players until you do?
+auto-team: true